README for the MASSES uv data for the pointing toward Per-emb-12.

Visibility (uv) data is delivered for both the spectral lines and continuum.

The format for each spectral line uv data file in a MASSES dataverse is:
[targetname].[configuration].[linename].[tracknumber].uvfits

The format for the continuum uv data in a MASSES dataverse is: 
[targetname].cont[wavelength].[sideband].[tracknumber].uvfits

Continuum uv data are delivered for 1.3 mm and 850 um.
The delivered spectral lines at 1.3 mm are 12CO21, 13CO21, C18O21, and N2DP.
The delivered spectral lines at 850 um are 12CO32, HCOP, H13COP.
Table A3 in the full data release paper indicates which lines are detected for each pointing.

For Per-emb-12, there are two SUB tracks.
Track 141123 was taken with the ASIC correlator.
Track 141213 was taken with the ASIC correlator.
For Per-emb-12, there is a single EXT track taken with the ASIC correlator: 140907
No 850 um data was taken in the EXT configuration.

To import uvfits files into miriad, the "fits" task should be used. "op=uvin" and "options=varwt" must be specified. We show an example for CO(2-1) below:
fits in=Per12.12CO21.141123.uvfits out=Per12.12CO21.141123.miriad.uv op=uvin options=varwt

To import into casa, the task importuvfits should be used:
importuvfits(fitsfile="Per12.12CO21.141123.uvfits",vis="Per12.12CO21.141123.casa.uv")
Rest frequencies for each spectral line need to be specified in casa to show proper velocities.
